Sophomore students organized a free raffle for prizes

Assignment Help Applied Statistics

Reference no: EM13716758

X 4 3 5 11 10 14

Y 6 7 12 17 9 21

1. For the X,Y data compute:

a. r and determine if it is significantly different from zero.

b. the slope of the regression line and test if it differs significantly from zero.

c. the 95% confidence interval for the slope.

2. At a school pep rally, a group of sophomore students organized a free raffle for prizes. They claim that they put the names of all of the students in the school in the basket and that they randomly drew 36 names out of this basket. Of the prize winners, 6 were freshmen, 14 were sophomores, 9 were juniors, and 7 were seniors. The results do not seem that random to you. You think it is a little fishy that sophomores organized the raffle and also won the most prizes. Your school is composed of 30% freshman, 25% juniors, 25% sophomores, and 20% seniors.

b. Conduct a significance test to determine whether the winners of the prizes were distributed throughout the classes as would be expected based on the percentage of students in each group. Report your Chi Square and p values.

c. What do you conclude?

3. A geologist collects hand-specimen sized pieces of lime stone from a particular area. A qualitative assessment of both texture and color is made with the following results.

Fine: 4 light, 20 medium, 8 dark Medium: 5 light, 23 medium, 12 dark Coarse: 21 light, 23 medium, 4 dark

Is there evidence of association between color and texture for these lime stones? Explain your answer.

5. Do men and women select different breakfasts? The breakfasts ordered by randomly selecting men and women at a popular breakfast place is shown. Conduct a test for homogeneity at a 5% level of significance.

6. Can a coefficient of determination be negative? Why or why not?

7. The cost of a leading liquid laundry detergent in different sizes is given below. Size (ounces) Cost ($) 16 4 32 5 64 6 200 11

a. Is the least squares line valid for predicting what a 300 ounce size of the laundry detergent would cost? Why or why not?

b. What is the slope of the least squares (best-fit) line? Interpret the slope.

8. Use the information to answer questions a, b, c and d: Suppose an airline claims that its flights are consistently on time with an average delay of at most 15 minutes. It claims that the average delay is so consistent that the variance is no more than 150 minutes. Doubting the consistency part of the claim, a disgruntled traveler calculates the delays for his next 25 fights is 22 minutes with a standard deviation of 15 minutes.

a. df =

b. Let α = .05

c. Decision:

d. Conclusion (write out in a complete sentence):

Reference no: EM13716758

Questions Cloud

Calculate the molarity m of al3+ in final solution : A 75.0 mL volume of 0.0902 M Al(NO3)3 is diluted with water to a volume of 1.00 L. Then a 0.000100 L volume of this new solution was diluted with water to a volume of 0.00750 L. Calculate the molarity (M) of Al3+ in the final solution.

Business research project : Using the scenario and two variables your learning team developed for the Week 2 Business Research Project Part 1 assignment, create a paper of no more than 700 words in which the goal is to submit a random sampling plan in such detail that ano..

Identify a cost reduction or performance improvement : Identify a cost reduction or performance improvement opportunity in a real business (large or small) or in any organization to apply one of the techniques discussed in the course. Collect real data and be ready to defend your assumptions ab..

Sixto sanchez is the owner of suburban stylists : 5. Sixto Sanchez is the owner of Suburban Stylists. He is evaluating the service level provided to walk-in customers. Because he is enrolled in an MBA program at Eastern University, Sixto decides to sample walk-in customers for the next two w..

Sophomore students organized a free raffle for prizes : 2. At a school pep rally, a group of sophomore students organized a free raffle for prizes. They claim that they put the names of all of the students in the school in the basket and that they randomly drew 36 names out of this basket. Of the pr..

The average monthly rent for one bedroom apartments : The average Monthly rent for one bedroom apartments in Chattanooga has been $700. Because of the downturn in the real estate market, it is believed that there has been a decrease in the average rental. State the null and alternative hypothesis

Imagine that you had been born the opposite sex : Part 1: Imagine that you had been born the opposite sex. Would your life thus far have been different? Do you think your future would be different than you now envision it? If so, how? Discuss two or three ways in which your life would be di..

Retail experience : The Mall of America has more than ten thousand workers, occupies more than four million square feet, and receives more than forty million visitors each year. However, the mall offers more than just shopping. Concerts, plays, story times for c..

Norm violation then address each of the items : You are then to write at LEAST one page that addresses each of the items above. In addition, you should describe what you did. Tell me the story of your norm violation, then address each of the items above.

User Account

All Pages